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-rw-r--r--plug-ins/common/sparkle.c1189
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diff --git a/plug-ins/common/sparkle.c b/plug-ins/common/sparkle.c
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+/* Sparkle --- image filter plug-in for GIMP
+ * Copyright (C) 1996 by John Beale; ported to Gimp by Michael J. Hammel;
+ *
+ * It has been optimized a little, bugfixed and modified by Martin Weber
+ * for additional functionality. Also bugfixed by Seth Burgess (9/17/03)
+ * to take rowstrides into account when selections are present (bug #50911).
+ * Attempted reformatting.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * You can contact Michael at mjhammel@csn.net
+ * You can contact Martin at martweb@gmx.net
+ * You can contact Seth at sjburges@gimp.org
+ */
+
+/*
+ * Sparkle 1.27 - simulate pixel bloom and diffraction effects
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <libgimp/gimp.h>
+#include <libgimp/gimpui.h>
+
+#include "libgimp/stdplugins-intl.h"
+
+
+#define PLUG_IN_PROC "plug-in-sparkle"
+#define PLUG_IN_BINARY "sparkle"
+#define PLUG_IN_ROLE "gimp-sparkle"
+
+#define SCALE_WIDTH 175
+#define ENTRY_WIDTH 7
+#define MAX_CHANNELS 4
+#define PSV 2 /* point spread value */
+
+#define NATURAL 0
+#define FOREGROUND 1
+#define BACKGROUND 2
+
+
+typedef struct
+{
+ gdouble lum_threshold;
+ gdouble flare_inten;
+ gdouble spike_len;
+ gdouble spike_pts;
+ gdouble spike_angle;
+ gdouble density;
+ gdouble transparency;
+ gdouble random_hue;
+ gdouble random_saturation;
+ gboolean preserve_luminosity;
+ gboolean inverse;
+ gboolean border;
+ gint colortype;
+} SparkleVals;
+
+
+/* Declare local functions.
+ */
+
+static void query (void);
+static void run (const gchar *name,
+ gint nparams,
+ const GimpParam *param,
+ gint *nreturn_vals,
+ GimpParam **return_vals);
+
+static gboolean sparkle_dialog (gint32 drawable_ID);
+
+static gint compute_luminosity (const guchar *pixel,
+ gboolean gray,
+ gboolean has_alpha);
+static gint compute_lum_threshold (gint32 drawable_ID,
+ gdouble percentile);
+static void sparkle (gint32 drawable_ID,
+ GimpPreview *preview);
+static void sparkle_preview (gpointer drawable_ID,
+ GimpPreview *preview);
+static void fspike (GeglBuffer *src_buffer,
+ GeglBuffer *dest_buffer,
+ const Babl *format,
+ gint bytes,
+ gint x1,
+ gint y1,
+ gint x2,
+ gint y2,
+ gint xr,
+ gint yr,
+ gdouble inten,
+ gdouble length,
+ gdouble angle,
+ GRand *gr,
+ guchar *dest_buf);
+static void rpnt (GeglBuffer *dest_buffer,
+ const Babl *format,
+ gint x1,
+ gint y1,
+ gint x2,
+ gint y2,
+ gdouble xr,
+ gdouble yr,
+ gint bytes,
+ gdouble inten,
+ guchar color[MAX_CHANNELS],
+ guchar *dest_buf);
+
+const GimpPlugInInfo PLUG_IN_INFO =
+{
+ NULL, /* init_proc */
+ NULL, /* quit_proc */
+ query, /* query_proc */
+ run, /* run_proc */
+};
+
+static SparkleVals svals =
+{
+ 0.001, /* luminosity threshold */
+ 0.5, /* flare intensity */
+ 20.0, /* spike length */
+ 4.0, /* spike points */
+ 15.0, /* spike angle */
+ 1.0, /* spike density */
+ 0.0, /* transparency */
+ 0.0, /* random hue */
+ 0.0, /* random saturation */
+ FALSE, /* preserve_luminosity */
+ FALSE, /* inverse */
+ FALSE, /* border */
+ NATURAL /* colortype */
+};
+
+static gint num_sparkles;
+
+
+MAIN ()
+
+static void
+query (void)
+{
+ static const GimpParamDef args[] =
+ {
+ { GIMP_PDB_INT32, "run-mode", "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
+ { GIMP_PDB_IMAGE, "image", "Input image (unused)" },
+ { GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
+ { GIMP_PDB_FLOAT, "lum-threshold", "Luminosity threshold (0.0 - 1.0)" },
+ { GIMP_PDB_FLOAT, "flare-inten", "Flare intensity (0.0 - 1.0)" },
+ { GIMP_PDB_INT32, "spike-len", "Spike length (in pixels)" },
+ { GIMP_PDB_INT32, "spike-pts", "# of spike points" },
+ { GIMP_PDB_INT32, "spike-angle", "Spike angle (0-360 degrees, -1: random)" },
+ { GIMP_PDB_FLOAT, "density", "Spike density (0.0 - 1.0)" },
+ { GIMP_PDB_FLOAT, "transparency", "Transparency (0.0 - 1.0)" },
+ { GIMP_PDB_FLOAT, "random-hue", "Random hue (0.0 - 1.0)" },
+ { GIMP_PDB_FLOAT, "random-saturation", "Random saturation (0.0 - 1.0)" },
+ { GIMP_PDB_INT32, "preserve-luminosity", "Preserve luminosity (TRUE/FALSE)" },
+ { GIMP_PDB_INT32, "inverse", "Inverse (TRUE/FALSE)" },
+ { GIMP_PDB_INT32, "border", "Add border (TRUE/FALSE)" },
+ { GIMP_PDB_INT32, "color-type", "Color of sparkles: { NATURAL (0), FOREGROUND (1), BACKGROUND (2) }" }
+ };
+
+ gimp_install_procedure (PLUG_IN_PROC,
+ N_("Turn bright spots into starry sparkles"),
+ "Uses a percentage based luminoisty threhsold to find "
+ "candidate pixels for adding some sparkles (spikes). ",
+ "John Beale, & (ported to GIMP v0.54) Michael "
+ "J. Hammel & ted to GIMP v1.0) & Seth Burgess & "
+ "Spencer Kimball",
+ "John Beale",
+ "Version 1.27, September 2003",
+ N_("_Sparkle..."),
+ "RGB*, GRAY*",
+ GIMP_PLUGIN,
+ G_N_ELEMENTS (args), 0,
+ args, NULL);
+
+ gimp_plugin_menu_register (PLUG_IN_PROC,
+ "<Image>/Filters/Light and Shadow/Light");
+}
+
+static void
+run (const gchar *name,
+ gint nparams,
+ const GimpParam *param,
+ gint *nreturn_vals,
+ GimpParam **return_vals)
+{
+ static GimpParam values[1];
+ GimpRunMode run_mode;
+ gint32 drawable_ID;
+ GimpPDBStatusType status = GIMP_PDB_SUCCESS;
+ gint x, y, w, h;
+
+ INIT_I18N ();
+ gegl_init (NULL, NULL);
+
+ *nreturn_vals = 1;
+ *return_vals = values;
+
+ values[0].type = GIMP_PDB_STATUS;
+ values[0].data.d_status = status;
+
+ run_mode = param[0].data.d_int32;
+ drawable_ID = param[2].data.d_drawable;
+
+ if (! gimp_drawable_mask_intersect (drawable_ID, &x, &y, &w, &h))
+ {
+ g_message (_("Region selected for filter is empty"));
+ return;
+ }
+
+ switch (run_mode)
+ {
+ case GIMP_RUN_INTERACTIVE:
+ /* Possibly retrieve data */
+ gimp_get_data (PLUG_IN_PROC, &svals);
+
+ /* First acquire information with a dialog */
+ if (! sparkle_dialog (drawable_ID))
+ return;
+ break;
+
+ case GIMP_RUN_NONINTERACTIVE:
+ /* Make sure all the arguments are there! */
+ if (nparams != 16)
+ {
+ status = GIMP_PDB_CALLING_ERROR;
+ }
+ else
+ {
+ svals.lum_threshold = param[3].data.d_float;
+ svals.flare_inten = param[4].data.d_float;
+ svals.spike_len = param[5].data.d_int32;
+ svals.spike_pts = param[6].data.d_int32;
+ svals.spike_angle = param[7].data.d_int32;
+ svals.density = param[8].data.d_float;
+ svals.transparency = param[9].data.d_float;
+ svals.random_hue = param[10].data.d_float;
+ svals.random_saturation = param[11].data.d_float;
+ svals.preserve_luminosity = (param[12].data.d_int32) ? TRUE : FALSE;
+ svals.inverse = (param[13].data.d_int32) ? TRUE : FALSE;
+ svals.border = (param[14].data.d_int32) ? TRUE : FALSE;
+ svals.colortype = param[15].data.d_int32;
+
+ if (svals.lum_threshold < 0.0 || svals.lum_threshold > 1.0)
+ status = GIMP_PDB_CALLING_ERROR;
+ else if (svals.flare_inten < 0.0 || svals.flare_inten > 1.0)
+ status = GIMP_PDB_CALLING_ERROR;
+ else if (svals.spike_len < 0)
+ status = GIMP_PDB_CALLING_ERROR;
+ else if (svals.spike_pts < 0)
+ status = GIMP_PDB_CALLING_ERROR;
+ else if (svals.spike_angle < -1 || svals.spike_angle > 360)
+ status = GIMP_PDB_CALLING_ERROR;
+ else if (svals.density < 0.0 || svals.density > 1.0)
+ status = GIMP_PDB_CALLING_ERROR;
+ else if (svals.transparency < 0.0 || svals.transparency > 1.0)
+ status = GIMP_PDB_CALLING_ERROR;
+ else if (svals.random_hue < 0.0 || svals.random_hue > 1.0)
+ status = GIMP_PDB_CALLING_ERROR;
+ else if (svals.random_saturation < 0.0 ||
+ svals.random_saturation > 1.0)
+ status = GIMP_PDB_CALLING_ERROR;
+ else if (svals.colortype < NATURAL || svals.colortype > BACKGROUND)
+ status = GIMP_PDB_CALLING_ERROR;
+ }
+ break;
+
+ case GIMP_RUN_WITH_LAST_VALS:
+ /* Possibly retrieve data */
+ gimp_get_data (PLUG_IN_PROC, &svals);
+ break;
+
+ default:
+ break;
+ }
+
+ /* Make sure that the drawable is gray or RGB color */
+ if (gimp_drawable_is_rgb (drawable_ID) ||
+ gimp_drawable_is_gray (drawable_ID))
+ {
+ gimp_progress_init (_("Sparkling"));
+
+ sparkle (drawable_ID, NULL);
+
+ if (run_mode != GIMP_RUN_NONINTERACTIVE)
+ gimp_displays_flush ();
+
+ /* Store mvals data */
+ if (run_mode == GIMP_RUN_INTERACTIVE)
+ gimp_set_data (PLUG_IN_PROC, &svals, sizeof (SparkleVals));
+ }
+ else
+ {
+ /* gimp_message ("sparkle: cannot operate on indexed color images"); */
+ status = GIMP_PDB_EXECUTION_ERROR;
+ }
+
+ values[0].data.d_status = status;
+}
+
+static gboolean
+sparkle_dialog (gint32 drawable_ID)
+{
+ GtkWidget *dialog;
+ GtkWidget *main_vbox;
+ GtkWidget *preview;
+ GtkWidget *vbox;
+ GtkWidget *hbox;
+ GtkWidget *table;
+ GtkWidget *toggle;
+ GtkWidget *r1, *r2, *r3;
+ GtkObject *scale_data;
+ gboolean run;
+
+ gimp_ui_init (PLUG_IN_BINARY, FALSE);
+
+ dialog = gimp_dialog_new (_("Sparkle"), PLUG_IN_ROLE,
+ NULL, 0,
+ gimp_standard_help_func, PLUG_IN_PROC,
+
+ _("_Cancel"), GTK_RESPONSE_CANCEL,
+ _("_OK"), GTK_RESPONSE_OK,
+
+ NULL);
+
+ gtk_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
+ GTK_RESPONSE_OK,
+ GTK_RESPONSE_CANCEL,
+ -1);
+
+ gimp_window_set_transient (GTK_WINDOW (dialog));
+
+ main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
+ gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
+ gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
+ main_vbox, TRUE, TRUE, 0);
+ gtk_widget_show (main_vbox);
+
+ preview = gimp_drawable_preview_new_from_drawable_id (drawable_ID);
+ gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0);
+ gtk_widget_show (preview);
+ g_signal_connect_swapped (preview, "invalidated",
+ G_CALLBACK (sparkle_preview),
+ GINT_TO_POINTER (drawable_ID));
+
+ table = gtk_table_new (9, 3, FALSE);
+ gtk_table_set_col_spacings (GTK_TABLE (table), 6);
+ gtk_table_set_row_spacings (GTK_TABLE (table), 6);
+ gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);
+ gtk_widget_show (table);
+
+ scale_data =
+ gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
+ _("Luminosity _threshold:"), SCALE_WIDTH, ENTRY_WIDTH,
+ svals.lum_threshold, 0.0, 0.1, 0.001, 0.01, 3,
+ TRUE, 0, 0,
+ _("Adjust the luminosity threshold"), NULL);
+ g_signal_connect (scale_data, "value-changed",
+ G_CALLBACK (gimp_double_adjustment_update),
+ &svals.lum_threshold);
+ g_signal_connect_swapped (scale_data, "value-changed",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+
+ scale_data =
+ gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
+ _("F_lare intensity:"), SCALE_WIDTH, ENTRY_WIDTH,
+ svals.flare_inten, 0.0, 1.0, 0.01, 0.1, 2,
+ TRUE, 0, 0,
+ _("Adjust the flare intensity"), NULL);
+ g_signal_connect (scale_data, "value-changed",
+ G_CALLBACK (gimp_double_adjustment_update),
+ &svals.flare_inten);
+ g_signal_connect_swapped (scale_data, "value-changed",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+
+ scale_data =
+ gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
+ _("_Spike length:"), SCALE_WIDTH, ENTRY_WIDTH,
+ svals.spike_len, 1, 100, 1, 10, 0,
+ TRUE, 0, 0,
+ _("Adjust the spike length"), NULL);
+ g_signal_connect (scale_data, "value-changed",
+ G_CALLBACK (gimp_double_adjustment_update),
+ &svals.spike_len);
+ g_signal_connect_swapped (scale_data, "value-changed",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+
+ scale_data =
+ gimp_scale_entry_new (GTK_TABLE (table), 0, 3,
+ _("Sp_ike points:"), SCALE_WIDTH, ENTRY_WIDTH,
+ svals.spike_pts, 0, 16, 1, 4, 0,
+ TRUE, 0, 0,
+ _("Adjust the number of spikes"), NULL);
+ g_signal_connect (scale_data, "value-changed",
+ G_CALLBACK (gimp_double_adjustment_update),
+ &svals.spike_pts);
+ g_signal_connect_swapped (scale_data, "value-changed",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+
+ scale_data =
+ gimp_scale_entry_new (GTK_TABLE (table), 0, 4,
+ _("Spi_ke angle (-1: random):"), SCALE_WIDTH, ENTRY_WIDTH,
+ svals.spike_angle, -1, 360, 1, 15, 0,
+ TRUE, 0, 0,
+ _("Adjust the spike angle "
+ "(-1 causes a random angle to be chosen)"), NULL);
+ g_signal_connect (scale_data, "value-changed",
+ G_CALLBACK (gimp_double_adjustment_update),
+ &svals.spike_angle);
+ g_signal_connect_swapped (scale_data, "value-changed",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+
+ scale_data =
+ gimp_scale_entry_new (GTK_TABLE (table), 0, 5,
+ _("Spik_e density:"), SCALE_WIDTH, ENTRY_WIDTH,
+ svals.density, 0.0, 1.0, 0.01, 0.1, 2,
+ TRUE, 0, 0,
+ _("Adjust the spike density"), NULL);
+ g_signal_connect (scale_data, "value-changed",
+ G_CALLBACK (gimp_double_adjustment_update),
+ &svals.density);
+ g_signal_connect_swapped (scale_data, "value-changed",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+
+ scale_data =
+ gimp_scale_entry_new (GTK_TABLE (table), 0, 6,
+ _("Tr_ansparency:"), SCALE_WIDTH, ENTRY_WIDTH,
+ svals.transparency, 0.0, 1.0, 0.01, 0.1, 2,
+ TRUE, 0, 0,
+ _("Adjust the opacity of the spikes"), NULL);
+ g_signal_connect (scale_data, "value-changed",
+ G_CALLBACK (gimp_double_adjustment_update),
+ &svals.transparency);
+ g_signal_connect_swapped (scale_data, "value-changed",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+
+ scale_data =
+ gimp_scale_entry_new (GTK_TABLE (table), 0, 7,
+ _("_Random hue:"), SCALE_WIDTH, ENTRY_WIDTH,
+ svals.random_hue, 0.0, 1.0, 0.01, 0.1, 2,
+ TRUE, 0, 0,
+ _("Adjust how much the hue should be changed randomly"), NULL);
+ g_signal_connect (scale_data, "value-changed",
+ G_CALLBACK (gimp_double_adjustment_update),
+ &svals.random_hue);
+ g_signal_connect_swapped (scale_data, "value-changed",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+
+ scale_data =
+ gimp_scale_entry_new (GTK_TABLE (table), 0, 8,
+ _("Rando_m saturation:"), SCALE_WIDTH, ENTRY_WIDTH,
+ svals.random_saturation, 0.0, 1.0, 0.01, 0.1, 2,
+ TRUE, 0, 0,
+ _("Adjust how much the saturation should be changed randomly"),
+ NULL);
+ g_signal_connect (scale_data, "value-changed",
+ G_CALLBACK (gimp_double_adjustment_update),
+ &svals.random_saturation);
+ g_signal_connect_swapped (scale_data, "value-changed",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+
+ hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 12);
+ gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0);
+ gtk_widget_show (hbox);
+
+ vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
+ gtk_box_pack_start (GTK_BOX (hbox), vbox, TRUE, TRUE, 0);
+ gtk_widget_show (vbox);
+
+ toggle = gtk_check_button_new_with_mnemonic (_("_Preserve luminosity"));
+ gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
+ gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
+ svals.preserve_luminosity);
+ gtk_widget_show (toggle);
+
+ gimp_help_set_help_data (toggle,
+ _("Should the luminosity be preserved?"), NULL);
+
+ g_signal_connect (toggle, "toggled",
+ G_CALLBACK (gimp_toggle_button_update),
+ &svals.preserve_luminosity);
+ g_signal_connect_swapped (toggle, "toggled",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+
+ toggle = gtk_check_button_new_with_mnemonic (_("In_verse"));
+ gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
+ gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), svals.inverse);
+ gtk_widget_show (toggle);
+
+ gimp_help_set_help_data (toggle,
+ _("Should the effect be inversed?"), NULL);
+
+ g_signal_connect (toggle, "toggled",
+ G_CALLBACK (gimp_toggle_button_update),
+ &svals.inverse);
+ g_signal_connect_swapped (toggle, "toggled",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+
+ toggle = gtk_check_button_new_with_mnemonic (_("A_dd border"));
+ gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
+ gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), svals.border);
+ gtk_widget_show (toggle);
+
+ gimp_help_set_help_data (toggle,
+ _("Draw a border of spikes around the image"), NULL);
+
+ g_signal_connect (toggle, "toggled",
+ G_CALLBACK (gimp_toggle_button_update),
+ &svals.border);
+ g_signal_connect_swapped (toggle, "toggled",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+
+ /* colortype */
+ vbox = gimp_int_radio_group_new (FALSE, NULL,
+ G_CALLBACK (gimp_radio_button_update),
+ &svals.colortype, svals.colortype,
+
+ _("_Natural color"), NATURAL, &r1,
+ _("_Foreground color"), FOREGROUND, &r2,
+ _("_Background color"), BACKGROUND, &r3,
+
+ NULL);
+
+ gtk_box_pack_start (GTK_BOX (hbox), vbox, TRUE, TRUE, 0);
+ gtk_widget_show (vbox);
+
+ gimp_help_set_help_data (r1, _("Use the color of the image"), NULL);
+ gimp_help_set_help_data (r2, _("Use the foreground color"), NULL);
+ gimp_help_set_help_data (r3, _("Use the background color"), NULL);
+ g_signal_connect_swapped (r1, "toggled",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+ g_signal_connect_swapped (r2, "toggled",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+ g_signal_connect_swapped (r3, "toggled",
+ G_CALLBACK (gimp_preview_invalidate),
+ preview);
+
+ gtk_widget_show (dialog);
+
+ run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
+
+ gtk_widget_destroy (dialog);
+
+ return run;
+}
+
+static gint
+compute_luminosity (const guchar *pixel,
+ gboolean gray,
+ gboolean has_alpha)
+{
+ gint pixel0, pixel1, pixel2;
+
+ if (svals.inverse)
+ {
+ pixel0 = 255 - pixel[0];
+ pixel1 = 255 - pixel[1];
+ pixel2 = 255 - pixel[2];
+ }
+ else
+ {
+ pixel0 = pixel[0];
+ pixel1 = pixel[1];
+ pixel2 = pixel[2];
+ }
+
+ if (gray)
+ {
+ if (has_alpha)
+ return (pixel0 * pixel1) / 255;
+ else
+ return (pixel0);
+ }
+ else
+ {
+ gint min, max;
+
+ min = MIN (pixel0, pixel1);
+ min = MIN (min, pixel2);
+ max = MAX (pixel0, pixel1);
+ max = MAX (max, pixel2);
+
+ if (has_alpha)
+ return ((min + max) * pixel[3]) / 510;
+ else
+ return (min + max) / 2;
+ }
+}
+
+static gint
+compute_lum_threshold (gint32 drawable_ID,
+ gdouble percentile)
+{
+ GeglBuffer *src_buffer;
+ GeglBufferIterator *iter;
+ const Babl *format;
+ gint bpp;
+ gint values[256];
+ gint total, sum;
+ gboolean gray;
+ gboolean has_alpha;
+ gint i;
+ gint x1, y1;
+ gint width, height;
+
+ /* zero out the luminosity values array */
+ memset (values, 0, sizeof (gint) * 256);
+
+ if (! gimp_drawable_mask_intersect (drawable_ID,
+ &x1, &y1, &width, &height))
+ return 0;
+
+ gray = gimp_drawable_is_gray (drawable_ID);
+ has_alpha = gimp_drawable_has_alpha (drawable_ID);
+
+ if (gray)
+ {
+ if (has_alpha)
+ format = babl_format ("Y'A u8");
+ else
+ format = babl_format ("Y' u8");
+ }
+ else
+ {
+ if (has_alpha)
+ format = babl_format ("R'G'B'A u8");
+ else
+ format = babl_format ("R'G'B' u8");
+ }
+
+ bpp = babl_format_get_bytes_per_pixel (format);
+
+ src_buffer = gimp_drawable_get_buffer (drawable_ID);
+
+ iter = gegl_buffer_iterator_new (src_buffer,
+ GEGL_RECTANGLE (x1, y1, width, height), 0,
+ format,
+ GEGL_ACCESS_READ, GEGL_ABYSS_NONE, 1);
+
+ while (gegl_buffer_iterator_next (iter))
+ {
+ const guchar *src = iter->items[0].data;
+ gint length = iter->length;
+
+ while (length--)
+ {
+ values [compute_luminosity (src, gray, has_alpha)]++;
+ src += bpp;
+ }
+ }
+
+ g_object_unref (src_buffer);
+
+ total = width * height;
+ sum = 0;
+
+ for (i = 255; i >= 0; i--)
+ {
+ sum += values[i];
+ if ((gdouble) sum > percentile * (gdouble) total)
+ {
+ num_sparkles = sum;
+ return i;
+ }
+ }
+
+ return 0;
+}
+
+static void
+sparkle (gint32 drawable_ID,
+ GimpPreview *preview)
+{
+ GeglBuffer *src_buffer;
+ GeglBuffer *dest_buffer;
+ GeglBufferIterator *iter;
+ const Babl *format;
+ gint d_width, d_height;
+ gdouble nfrac, length, inten, spike_angle;
+ gint cur_progress, max_progress;
+ gint x1, y1, x2, y2;
+ gint width, height;
+ gint threshold;
+ gint lum, x, y, b;
+ gboolean gray, has_alpha;
+ gint alpha;
+ gint bytes;
+ GRand *gr;
+ guchar *dest_buf = NULL;
+
+ gray = gimp_drawable_is_gray (drawable_ID);
+ has_alpha = gimp_drawable_has_alpha (drawable_ID);
+
+ if (gray)
+ {
+ if (has_alpha)
+ format = babl_format ("Y'A u8");
+ else
+ format = babl_format ("Y' u8");
+ }
+ else
+ {
+ if (has_alpha)
+ format = babl_format ("R'G'B'A u8");
+ else
+ format = babl_format ("R'G'B' u8");
+ }
+
+ bytes = babl_format_get_bytes_per_pixel (format);
+
+ alpha = (has_alpha) ? bytes - 1 : bytes;
+
+ if (preview)
+ {
+ gimp_preview_get_position (preview, &x1, &y1);
+ gimp_preview_get_size (preview, &width, &height);
+
+ x2 = x1 + width;
+ y2 = y1 + height;
+ dest_buf = g_new0 (guchar, width * height * bytes);
+ }
+ else
+ {
+ if (! gimp_drawable_mask_intersect (drawable_ID,
+ &x1, &y1, &width, &height))
+ return;
+
+ x2 = x1 + width;
+ y2 = y1 + height;
+ }
+
+ if (width < 1 || height < 1)
+ return;
+
+ d_width = gimp_drawable_width (drawable_ID);
+ d_height = gimp_drawable_height (drawable_ID);
+
+ gr = g_rand_new ();
+
+ if (svals.border)
+ {
+ num_sparkles = 2 * (width + height);
+ threshold = 255;
+ }
+ else
+ {
+ /* compute the luminosity which exceeds the luminosity threshold */
+ threshold = compute_lum_threshold (drawable_ID, svals.lum_threshold);
+ }
+
+ /* initialize the progress dialog */
+ cur_progress = 0;
+ max_progress = num_sparkles;
+
+ /* copy what is already there */
+ src_buffer = gimp_drawable_get_buffer (drawable_ID);
+ dest_buffer = gimp_drawable_get_shadow_buffer (drawable_ID);
+
+ iter = gegl_buffer_iterator_new (src_buffer,
+ GEGL_RECTANGLE (x1, y1, width, height), 0,
+ format,
+ GEGL_ACCESS_READ, GEGL_ABYSS_NONE, 2);
+
+ gegl_buffer_iterator_add (iter, dest_buffer,
+ GEGL_RECTANGLE (x1, y1, width, height), 0,
+ format,
+ GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE);
+
+ while (gegl_buffer_iterator_next (iter))
+ {
+ GeglRectangle roi = iter->items[0].roi;
+ const guchar *src, *s;
+ guchar *dest, *d;
+
+ src = iter->items[0].data;
+ if (preview)
+ dest = dest_buf + (((roi.y - y1) * width) + (roi.x - x1)) * bytes;
+ else
+ dest = iter->items[1].data;
+
+ for (y = 0; y < roi.height; y++)
+ {
+ s = src;
+ d = dest;
+
+ for (x = 0; x < roi.width; x++)
+ {
+ if (has_alpha && s[alpha] == 0)
+ {
+ memset (d, 0, alpha);
+ }
+ else
+ {
+ for (b = 0; b < alpha; b++)
+ d[b] = s[b];
+ }
+
+ if (has_alpha)
+ d[alpha] = s[alpha];
+
+ s += bytes;
+ d += bytes;
+ }
+
+ src += roi.width * bytes;
+ if (preview)
+ dest += width * bytes;
+ else
+ dest += roi.width * bytes;
+ }
+ }
+
+ /* add effects to new image based on intensity of old pixels */
+
+ iter = gegl_buffer_iterator_new (src_buffer,
+ GEGL_RECTANGLE (x1, y1, width, height), 0,
+ format,
+ GEGL_ACCESS_READ, GEGL_ABYSS_NONE, 2);
+
+ gegl_buffer_iterator_add (iter, dest_buffer,
+ GEGL_RECTANGLE (x1, y1, width, height), 0,
+ format,
+ GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE);
+
+ while (gegl_buffer_iterator_next (iter))
+ {
+ GeglRectangle roi = iter->items[0].roi;
+ const guchar *src, *s;
+
+ src = iter->items[0].data;
+
+ for (y = 0; y < roi.height; y++)
+ {
+ s = src;
+
+ for (x = 0; x < roi.width; x++)
+ {
+ if (svals.border)
+ {
+ if (x + roi.x == 0 ||
+ y + roi.y == 0 ||
+ x + roi.x == d_width - 1 ||
+ y + roi.y == d_height - 1)
+ {
+ lum = 255;
+ }
+ else
+ {
+ lum = 0;
+ }
+ }
+ else
+ {
+ lum = compute_luminosity (s, gray, has_alpha);
+ }
+
+ if (lum >= threshold)
+ {
+ nfrac = fabs ((gdouble) (lum + 1 - threshold) /
+ (gdouble) (256 - threshold));
+ length = ((gdouble) svals.spike_len *
+ (gdouble) pow (nfrac, 0.8));
+ inten = svals.flare_inten * nfrac;
+
+ /* fspike im x,y intens rlength angle */
+ if (svals.spike_pts > 0)
+ {
+ /* major spikes */
+ if (svals.spike_angle == -1)
+ spike_angle = g_rand_double_range (gr, 0, 360.0);
+ else
+ spike_angle = svals.spike_angle;
+
+ if (g_rand_double (gr) <= svals.density)
+ {
+ fspike (src_buffer, dest_buffer, format, bytes,
+ x1, y1, x2, y2,
+ x + roi.x, y + roi.y,
+ inten, length, spike_angle, gr, dest_buf);
+
+ /* minor spikes */
+ fspike (src_buffer, dest_buffer, format, bytes,
+ x1, y1, x2, y2,
+ x + roi.x, y + roi.y,
+ inten * 0.7, length * 0.7,
+ ((gdouble)spike_angle+180.0/svals.spike_pts),
+ gr, dest_buf);
+ }
+ }
+ if (!preview)
+ {
+ cur_progress ++;
+
+ if ((cur_progress % 5) == 0)
+ gimp_progress_update ((double) cur_progress /
+ (double) max_progress);
+ }
+ }
+
+ s += bytes;
+ }
+
+ src += roi.width * bytes;
+ }
+ }
+
+ g_object_unref (src_buffer);
+ g_object_unref (dest_buffer);
+
+ if (preview)
+ {
+ gimp_preview_draw_buffer (preview, dest_buf, width * bytes);
+ g_free (dest_buf);
+ }
+ else
+ {
+ gimp_progress_update (1.0);
+
+ gimp_drawable_merge_shadow (drawable_ID, TRUE);
+ gimp_drawable_update (drawable_ID, x1, y1, width, height);
+ }
+
+ g_rand_free (gr);
+}
+
+static void
+sparkle_preview (gpointer drawable_ID,
+ GimpPreview *preview)
+{
+ sparkle (GPOINTER_TO_INT (drawable_ID), preview);
+}
+
+static inline void
+rpnt (GeglBuffer *dest_buffer,
+ const Babl *format,
+ gint x1,
+ gint y1,
+ gint x2,
+ gint y2,
+ gdouble xr,
+ gdouble yr,
+ gint bytes,
+ gdouble inten,
+ guchar color[MAX_CHANNELS],
+ guchar *dest_buf)
+{
+ gint x, y, b;
+ gdouble dx, dy, rs, val;
+ guchar *pixel;
+ guchar pixel_buf[4];
+ gdouble new;
+
+ x = (int) (xr); /* integer coord. to upper left of real point */
+ y = (int) (yr);
+
+ if (x >= x1 && y >= y1 && x < x2 && y < y2)
+ {
+ if (dest_buf)
+ {
+ pixel = dest_buf + ((y - y1) * (x2 - x1) + (x - x1)) * bytes;
+ }
+ else
+ {
+ gegl_buffer_sample (dest_buffer, x, y, NULL,
+ pixel_buf, format,
+ GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
+
+ pixel = pixel_buf;
+ }
+
+ dx = xr - x; dy = yr - y;
+ rs = dx * dx + dy * dy;
+ val = inten * exp (-rs / PSV);
+
+ for (b = 0; b < bytes; b++)
+ {
+ if (svals.inverse)
+ new = 255 - pixel[b];
+ else
+ new = pixel[b];
+
+ if (svals.preserve_luminosity)
+ {
+ if (new < color[b])
+ {
+ new *= (1.0 - val * (1.0 - svals.transparency));
+ }
+ else
+ {
+ new -= val * color[b] * (1.0 - svals.transparency);
+ if (new < 0.0)
+ new = 0.0;
+ }
+ }
+
+ new *= 1.0 - val * svals.transparency;
+ new += val * color[b];
+
+ if (new > 255)
+ new = 255;
+
+ if (svals.inverse)
+ pixel[b] = 255 - new;
+ else
+ pixel[b] = new;
+ }
+
+ if (! dest_buf)
+ gegl_buffer_set (dest_buffer, GEGL_RECTANGLE (x, y, 1, 1), 0,
+ format, pixel_buf,
+ GEGL_AUTO_ROWSTRIDE);
+ }
+}
+
+static void
+fspike (GeglBuffer *src_buffer,
+ GeglBuffer *dest_buffer,
+ const Babl *format,
+ gint bytes,
+ gint x1,
+ gint y1,
+ gint x2,
+ gint y2,
+ gint xr,
+ gint yr,
+ gdouble inten,
+ gdouble length,
+ gdouble angle,
+ GRand *gr,
+ guchar *dest_buf)
+{
+ const gdouble efac = 2.0;
+ gdouble xrt, yrt, dx, dy;
+ gdouble rpos;
+ gdouble in;
+ gdouble theta;
+ gdouble sfac;
+ gint r, g, b;
+ gint i;
+ gboolean ok;
+ GimpRGB gimp_color;
+ guchar pixel[MAX_CHANNELS];
+ guchar chosen_color[MAX_CHANNELS];
+ guchar color[MAX_CHANNELS];
+
+ theta = angle;
+
+ switch (svals.colortype)
+ {
+ case NATURAL:
+ break;
+
+ case FOREGROUND:
+ gimp_context_get_foreground (&gimp_color);
+ gimp_rgb_get_uchar (&gimp_color, &chosen_color[0], &chosen_color[1],
+ &chosen_color[2]);
+ break;
+
+ case BACKGROUND:
+ gimp_context_get_background (&gimp_color);
+ gimp_rgb_get_uchar (&gimp_color, &chosen_color[0], &chosen_color[1],
+ &chosen_color[2]);
+ break;
+ }
+
+ /* draw the major spikes */
+ for (i = 0; i < svals.spike_pts; i++)
+ {
+ gegl_buffer_sample (dest_buffer, xr, yr, NULL, pixel, format,
+ GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
+
+ if (svals.colortype == NATURAL)
+ {
+ color[0] = pixel[0];
+ color[1] = pixel[1];
+ color[2] = pixel[2];
+ }
+ else
+ {
+ color[0] = chosen_color[0];
+ color[1] = chosen_color[1];
+ color[2] = chosen_color[2];
+ }
+
+ color[3] = pixel[3];
+
+ if (svals.inverse)
+ {
+ color[0] = 255 - color[0];
+ color[1] = 255 - color[1];
+ color[2] = 255 - color[2];
+ }
+
+ if (svals.random_hue > 0.0 || svals.random_saturation > 0.0)
+ {
+ r = 255 - color[0];
+ g = 255 - color[1];
+ b = 255 - color[2];
+
+ gimp_rgb_to_hsv_int (&r, &g, &b);
+
+ r += svals.random_hue * g_rand_double_range (gr, -0.5, 0.5) * 255;
+
+ if (r >= 255)
+ r -= 255;
+ else if (r < 0)
+ r += 255;
+
+ b += (svals.random_saturation *
+ g_rand_double_range (gr, -1.0, 1.0)) * 255;
+
+ if (b > 255)
+ b = 255;
+
+ gimp_hsv_to_rgb_int (&r, &g, &b);
+
+ color[0] = 255 - r;
+ color[1] = 255 - g;
+ color[2] = 255 - b;
+ }
+
+ dx = 0.2 * cos (theta * G_PI / 180.0);
+ dy = 0.2 * sin (theta * G_PI / 180.0);
+ xrt = (gdouble) xr; /* (gdouble) is needed because some */
+ yrt = (gdouble) yr; /* compilers optimize too much otherwise */
+ rpos = 0.2;
+
+ do
+ {
+ sfac = inten * exp (-pow (rpos / length, efac));
+ ok = FALSE;
+
+ in = 0.2 * sfac;
+ if (in > 0.01)
+ ok = TRUE;
+
+ rpnt (dest_buffer, format, x1, y1, x2, y2,
+ xrt, yrt,
+ bytes, in, color, dest_buf);
+
+ rpnt (dest_buffer, format, x1, y1, x2, y2,
+ xrt + 1.0, yrt,
+ bytes, in, color, dest_buf);
+
+ rpnt (dest_buffer, format, x1, y1, x2, y2,
+ xrt + 1.0, yrt + 1.0,
+ bytes, in, color, dest_buf);
+
+ rpnt (dest_buffer, format, x1, y1, x2, y2,
+ xrt, yrt + 1.0,
+ bytes, in, color, dest_buf);
+
+ xrt += dx;
+ yrt += dy;
+ rpos += 0.2;
+
+ } while (ok);
+
+ theta += 360.0 / svals.spike_pts;
+ }
+}